The National Weather Service is predicting a cold, windy storm will reach Southern California early Tuesday morning, bringing rain to much of the Southland and snow to the mountains.

The snow level is expected to begin at 4,500 feet and drop to 2,000 feet, according to the weather service. On Friday, the forecast had called for a foot of snow. On Sunday night, the forecast suggested the accumulation may be far less: 4 to 8 inches.

Once the roads are closed, county officials warn, local access will not be permitted. The closures are to remain in effect until the storm system has passed and the roads have been inspected.

For more information and updates, area residents and motorists can visit the county’s website.